You'd think
you could enter any topic as a Subject search in Alvernia's Catalog. However,
the Subject search uses special terms to organize books by
subject. These are called Library
of Congress Subject Headings (LCSH for short). If you enter
your keywords as a Subject search, you may not get much back. For
example:

If you entered
a Subject Heading search for: acquired immune
deficiency you
would get no books!

But if you searched
using the LCSH term, AIDS (Disease)you'd
see the library has around 100 books.